Swallows massing

Hi - we’ve always had 2 or 3 pairs nesting here and a hand full of young flying about but over the last week it’s been like a swarm 

they usually mass here just before they migrate but never had so many as the last week - hot weather ? Or are they like adolescents who gather around not sure ? Put a few buckets of water out side if that helps - not sure if there is anything I can do to feed them etc 

This is a picture of a few on the telegraph lines but their everywhere 

  • Large shallow trays of water might possibly be a better way of offering water if you can, I found birds didn’t really like approaching buckets and small mammals can use shallow trays. Hopefully there is still a good supply of flying insects around for the swallows and your numbers are an indicator of them having had a good breeding seasons in your area